Muscles of Forearm and Hand

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Author:
msviolet_26
ID:
91935
Filename:
Muscles of Forearm and Hand
Updated:
2011-06-24 15:49:13
Tags:
muscles forearms hands
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Description:
Origin, Insertion, Action, Nerve Supply and Synergists
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  1. Pronates Quadratus
    • O: Distal 1/4 of the anterior surface of the ulna
    • I: Distal 1/4 of the anterior surface of the radius
    • A: Pronates the forearm
    • NS: Anterior interosseous branch of median nerve, C8,T1
    • S: Pronator Teres
  2. Palmaris Longus
    • O: Common flexor tendon from medial epidondyle of humerus
    • I: Flexor retinaculum and palmar aponeurosis
    • A: Flexes hand at the wrist
    • NS: Median, C7-8
    • S: Flexor carpi radialis, flexor carpi ulnaris, flexor digitorum superficialis

    *medial to flex. carpi radialis
  3. Flexor Carpi Radialis
    • O: Common flexor tendon from medial epicondyle of humerus
    • I: Anterior surfaces of bases of 2nd and 3rd metacarpals
    • A: Flexes and radially deviates the hand at the wrist
    • NS: Median nerve, C6-7
    • S: Flexor carpi ulnaris and palmaris longus for flexion. Extensor carpi radialis longus and brevis for radial deviation
  4. Flexor Carpi Ulnaris
    • O: By 2 heads from medial epicondyle of humerus and medial border of olecranon process of ulna
    • I: Palmar surface of pisiform and hamate carpal bones and base of 5th metacarpal
    • A: Flexes and ulnarly deviates the hand at the wrist
    • NS: Ulnar, C7-8
    • S: Flexor carpi radialis and palmaris longus for flexion. Extensor carpi ulnaris for ulnar deviation.
  5. Extensor Carpi Radialis Longus
    • O:Lower 1/3 of lateral supracondylar ridge, and a few fibers from lateral epicondyle
    • I: Posterior surface of base of second metacarpal
    • A: Extends and radially deviates the hand at the wrist
    • NS: Radial, C6,7
    • S: ECRB, ECU for extension. FCR for radial deviation
  6. Extensor Digitorum
    • O: Common extensor tendon from lateral epicondyle of humerus
    • I: By 4 tendons, 1 to each finger, each tendon dividing into 3 slips, the middle one attaching to the dorsal surface of middle phalanx and the other 2 uniting to attach to dorsal surface of base of distal phalanx
    • A: Extends phalanges at the interphalangeal joints, continued action extends the metacarpophalangeal and carpometacarpal articulations. Assists in extending wrist.
    • NS: Posterior interosseous (deep radial) C7,8
    • S: Extensor indicis, extensor digiti minimi, lumbricals
  7. Extensor Digiti Minimi
    • O: The common tendon of the extensor digitorum
    • I: The tendon of the extensor digitorum at the proximal phalanx of the little finger and into the dorsal expansion of the finger extensor tendons
    • A: Extends the rpoximal phalanx of the little finger at the metacarpophalangeal joint and assists extention at the wrist. Extends the middle and distal phalanges especially when the proximal phalnx is held in flexion
    • NS: Posterios interosseous (deep radial), C7-8
    • S: Extensor digitorum

    *The posterior interosseous nerve is a direct continuation of the deep radial nerve after it has passed through the supinator
  8. Extensor Carpi Radialis Brevis
    • O: Common extensor tendon from lateral epicondyle of humerus
    • I: Posterior surface of base of 3rd metacarpal
    • A: Extension and radial deviation of the hand at the wrist
    • NS: Posterior interosseous (deep radial), C7,8
    • S: ECRL, ECU for extention. ECRL, FCRL for radial deviation
  9. Extensor Carpi Ulnaris
    • O: By 2 heads from lateral epidondyle of humerus and middle 1/3 of posterior ridge of ulna
    • I: Posterior surface of base of 5th metacarpal
    • A: Extends and ulnarly deviates the hand at wrist.
    • NS: Posterior interosseous (deep radial), C7,8
    • S: ECRL, ECRB for extention. FCU for ulnar deviation
  10. Flexor Digitorum Superficialis
    • O: humero-ulnar head: medial epicondyle of humerus, ulnar collateral ligament and coronoid process of ulna
    • radial: oblique line of the radius extending from the radial tuberosity to the insertion of the pronator teres
    • I: 4 tendons (1 for each finger) divide for the passage of the tendons of flexor digitorum profundus then insert as 2 slips on the sides of the shaft of the middle phalanx
    • A: Flexes the phalanx of each finger on the proximal phalanx. Continued action, flexes the proximal phalanx at the hand, flexes the hand at the wrist
    • NS: Median, C7,8,T1
    • S: Flexor digitorum profundus
  11. Flexor Pollicis Longus
    • O: Anterior surfacr of middle 1/2 of radius. Adjacent interosseous membrane and a slip from the coronoid process of the ulna or medial epicondyle of humerus
    • I: Palmar surface of the base of the distal phalanx of the thumb
    • A: Flexes the IP jt. of thumb. Continued action, flexes the MCP and carpometacarpal articulations
    • NS: Anterior interosseous branch of the median C8, T1
    • S: FPB, Adductor pollicis
  12. Flexor Digitorum Profundus
    • O: Upper 3/4 of the anterior and medial surfaces of the ulna, interosseous membrane and deep fascia of the forearm
    • I: 4 tendons (1 each finger) to palmar surface of base of distal phalanx, after passing through tendon of flexor digitorum superficialis
    • A: Flexes the distal phalanges of the four fingers. Assists in flexing MCP, carpometacarpal and wrist joints.
    • NS: index and middle fingers -anterior interosseous ranch of the median nerve C8, T1; ring and little fingers, ulnar, C8,T1
    • S: Flexor digitorum superficialis
  13. Extensor Indicis
    • O: Dorsal surface of distal half of ulna
    • I: Index finger extensor digitorum tendon
    • A: Extension of all phalanges of index finger. Assists in wrist extention
    • NS: Posterior interosseous (deep radial) C7-8
    • S: Extensor digitorum
  14. Extensor Pollicis Longus
    • O: Posterior surface of the middle 1/3 of the ulna and the interosseous membrane
    • I: The posterior surfaceo f the base of the distal phalanx of the thumb
    • A: Extends the distal phalanx of the thumb. Continued action, extends proximal phalanx and MCP, and adducts the 1st MCP
    • NS: Posterior interosseous (deep radial) C7-8
    • S: Extensor pollicis brevis

    *medial part of anatomical snuffbox
  15. Extensor Pollicis Brevis
    • O: The posterior surface of the idstal end of the body of the ulna near the middle and the adjacent inteorsseous membrane
    • I: The posterior surface of the base of the proximal phalanx of the thumb
    • A: Extends the proximal phalanx of the thumb. Contined action extend and assists abduction of the 1st MCP
    • NS: Posterior interosseous (deep radial) C6,7
    • S: Abductor pollicis longus, extensor pollicis longus

    *lateral part of anatomical snuffbox
  16. Abductor Pollicis Longus
    • O: A small facet of the ulnar side of the radius near its middle. On the lateral side of the dorsal surface on the body of the ulna just below the insertion of anconeus and the interosseous membrane
    • I: The radial side of the base of the
    • 1st MCP
    • A: Abducts and assits in extension of the carpometacarpal joint of the thumb
    • NS: Posterior interosseous nerve (deep radial) C7,8
    • S: Abductor pollicis brevis, extensor pollicis brevis

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